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Guarantor Subsidiaries (Consolidating Statement Of Cash Flow) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Activities                      
Net income $ 66,700 $ 60,500 $ 26,200 $ 22,900 $ 98,400 $ 62,700 $ 73,200 $ 9,600 $ 176,340 $ 243,863 $ 235,033
Adjustments to reconcile net income to net cash provided by operating activities                      
(Income) loss from discontinued operations, net of taxes                 (38,749) (20,903) (80,898)
Depreciation and amortization                 86,568 79,087 74,053
Deferred and noncurrent income tax charges (credits)                 40,556 (4,403) (11,568)
Accretion on discounted liabilities                 1,521 1,200 1,096
Pretax (gains) losses from sale of assets                 4,658 (194) (5,995)
Net decrease (increase) in noncash operating working capital                 (46,586) (36,475) 51,204
Equity in earnings                 0 0 0
Other operating activities - net                 9,417 14,531 13,215
Net cash provided by (used in) continuing operations                 233,725 276,706 276,140
Net cash provided by (used in) discontinued operations                 (17,887) 28,876 80,558
Net cash provided by operating activities                 215,838 305,582 356,698
Investing Activities                      
Property additions                 (205,225) (135,339) (163,303)
Proceeds from sale of assets                 729 376 6,113
Changes in restricted cash                 (68,571) 0 0
Other investing activities - net                 (2,889) (10,631) 52
Sales proceeds                 93,765 1,097 173,118
Other                 (7,443) (4,918) (3,088)
Net cash provided by (required by) investing activities                 (189,634) (149,415) 12,892
Financing Activities                      
Purchase of treasury stock                 (248,695) (51,348) 0
Repayments of long-term debt                 (146) (70,000) (81,170)
Additions to long-term debt                 0 0 641,250
Cash dividend to former parent                 0 0 (650,000)
Debt issuance costs                 (58) (875) (6,693)
Amounts related to share-based compensation                 (3,075) (580) 0
Net distributions to former parent                 0 0 (35,609)
Net cash required by financing activities                 (251,974) (122,803) (132,222)
Net increase in cash and cash equivalents                 (225,770) 33,364 237,368
Cash and cash equivalents at January 1       328,105       294,741 328,105 294,741 57,373
Cash and cash equivalents at December 31 102,335       328,105       102,335 328,105 294,741
Less: Cash and cash equivalents held for sale 0       942       0 942 0
Cash and cash equivalents 102,335       327,163       102,335 327,163 294,741
Eliminations [Member]                      
Operating Activities                      
Net income                 (92,130) (440,963) 0
Adjustments to reconcile net income to net cash provided by operating activities                      
(Income) loss from discontinued operations, net of taxes                 0 0 0
Depreciation and amortization                 0 0 0
Deferred and noncurrent income tax charges (credits)                 0 0 0
Accretion on discounted liabilities                 0 0 0
Pretax (gains) losses from sale of assets                 0 0 0
Net decrease (increase) in noncash operating working capital                 0 0 0
Equity in earnings                 92,130 440,963 0
Other operating activities - net                 0 0 0
Net cash provided by (used in) continuing operations                 0 0 0
Net cash provided by (used in) discontinued operations                 0 0 0
Net cash provided by operating activities                 0 0 0
Investing Activities                      
Property additions                 0 0 0
Proceeds from sale of assets                 0 0 0
Changes in restricted cash                 0    
Other investing activities - net                 0 0 0
Sales proceeds                 0 0 0
Other                 0 0 0
Net cash provided by (required by) investing activities                 0 0 0
Financing Activities                      
Purchase of treasury stock                 0 0 0
Repayments of long-term debt                 0 0 0
Additions to long-term debt                 0 0 0
Cash dividend to former parent                     0
Debt issuance costs                 0 0 0
Amounts related to share-based compensation                 0 0 0
Net distributions to former parent                 0 0 0
Net cash required by financing activities                 0 0 0
Net increase in cash and cash equivalents                 0 0 0
Cash and cash equivalents at January 1       0       0 0 0 0
Cash and cash equivalents at December 31 0       0       0 0 0
Less: Cash and cash equivalents held for sale 0       0       0 0 0
Cash and cash equivalents 0       0       0 0 0
Parent Company [Member]                      
Operating Activities                      
Net income                 176,340 351,439 0
Adjustments to reconcile net income to net cash provided by operating activities                      
(Income) loss from discontinued operations, net of taxes                 0 0 0
Depreciation and amortization                 0 0 0
Deferred and noncurrent income tax charges (credits)                 0 0 0
Accretion on discounted liabilities                 0 0 0
Pretax (gains) losses from sale of assets                 0 0 0
Net decrease (increase) in noncash operating working capital                 0 0 0
Equity in earnings                 (176,340) (351,439) 0
Other operating activities - net                 0 0 0
Net cash provided by (used in) continuing operations                 0 0 0
Net cash provided by (used in) discontinued operations                 0 0 0
Net cash provided by operating activities                 0 0 0
Investing Activities                      
Property additions                 0 0 0
Proceeds from sale of assets                 0 0 0
Changes in restricted cash                 0    
Other investing activities - net                 0 0 0
Sales proceeds                 0 0 0
Other                 0 0 0
Net cash provided by (required by) investing activities                 0 0 0
Financing Activities                      
Purchase of treasury stock                 (248,695) (51,348) 0
Repayments of long-term debt                 0 0 0
Additions to long-term debt                 0 0 0
Cash dividend to former parent                     0
Debt issuance costs                 0 0 0
Amounts related to share-based compensation                 0 0 0
Net distributions to former parent                 248,695 51,348 0
Net cash required by financing activities                 0 0 0
Net increase in cash and cash equivalents                 0 0 0
Cash and cash equivalents at January 1       0       0 0 0 0
Cash and cash equivalents at December 31 0       0       0 0 0
Less: Cash and cash equivalents held for sale 0       0       0 0 0
Cash and cash equivalents 0       0       0 0 0
Issuer [Member]                      
Operating Activities                      
Net income                 114,861 312,485 154,136
Adjustments to reconcile net income to net cash provided by operating activities                      
(Income) loss from discontinued operations, net of taxes                 0 0 0
Depreciation and amortization                 86,568 79,087 74,053
Deferred and noncurrent income tax charges (credits)                 40,556 (4,403) (11,568)
Accretion on discounted liabilities                 1,521 1,200 1,096
Pretax (gains) losses from sale of assets                 4,658 (194) (5,995)
Net decrease (increase) in noncash operating working capital                 (46,586) (36,475) 51,204
Equity in earnings                 22,731 (89,524) 0
Other operating activities - net                 9,417 14,531 13,215
Net cash provided by (used in) continuing operations                 233,726 276,707 276,141
Net cash provided by (used in) discontinued operations                 0 0 0
Net cash provided by operating activities                 233,726 276,707 276,141
Investing Activities                      
Property additions                 (205,225) (135,339) (163,303)
Proceeds from sale of assets                 729 376 6,113
Changes in restricted cash                 (68,571)    
Other investing activities - net                 (2,889) (10,631) 52
Sales proceeds                 0 0 0
Other                 0 0 0
Net cash provided by (required by) investing activities                 (275,956) (145,594) (157,138)
Financing Activities                      
Purchase of treasury stock                 0 0 0
Repayments of long-term debt                 (146) (70,000) (80,000)
Additions to long-term debt                 0 0 641,250
Cash dividend to former parent                     (650,000)
Debt issuance costs                 (58) (875) (6,693)
Amounts related to share-based compensation                 (3,075) (580) 0
Net distributions to former parent                 (179,319) (27,236) 213,808
Net cash required by financing activities                 (182,598) (98,691) 118,365
Net increase in cash and cash equivalents                 (224,828) 32,422 237,368
Cash and cash equivalents at January 1       327,163       294,741 327,163 294,741 57,373
Cash and cash equivalents at December 31 102,335       327,163       102,335 327,163 294,741
Less: Cash and cash equivalents held for sale 0       0       0 0 0
Cash and cash equivalents 102,335       327,163       102,335 327,163 294,741
Guarantor Subsidiaries [Member]                      
Operating Activities                      
Net income                 (1) (1) (1)
Adjustments to reconcile net income to net cash provided by operating activities                      
(Income) loss from discontinued operations, net of taxes                 0 0 0
Depreciation and amortization                 0 0 0
Deferred and noncurrent income tax charges (credits)                 0 0 0
Accretion on discounted liabilities                 0 0 0
Pretax (gains) losses from sale of assets                 0 0 0
Net decrease (increase) in noncash operating working capital                 0 0 0
Equity in earnings                 0 0 0
Other operating activities - net                 0 0 0
Net cash provided by (used in) continuing operations                 (1) (1) (1)
Net cash provided by (used in) discontinued operations                 0 0 0
Net cash provided by operating activities                 (1) (1) (1)
Investing Activities                      
Property additions                 0 0 0
Proceeds from sale of assets                 0 0 0
Changes in restricted cash                 0    
Other investing activities - net                 0 0 0
Sales proceeds                 0 0 0
Other                 0 0 0
Net cash provided by (required by) investing activities                 0 0 0
Financing Activities                      
Purchase of treasury stock                 0 0 0
Repayments of long-term debt                 0 0 0
Additions to long-term debt                 0 0 0
Cash dividend to former parent                     0
Debt issuance costs                 0 0 0
Amounts related to share-based compensation                 0 0 0
Net distributions to former parent                 1 1 1
Net cash required by financing activities                 1 1 1
Net increase in cash and cash equivalents                 0 0 0
Cash and cash equivalents at January 1       0       0 0 0 0
Cash and cash equivalents at December 31 0       0       0 0 0
Less: Cash and cash equivalents held for sale 0       0       0 0 0
Cash and cash equivalents 0       0       0 0 0
Non-Guarantor Subsidiaries [Member]                      
Operating Activities                      
Net income                 (22,730) 20,903 80,898
Adjustments to reconcile net income to net cash provided by operating activities                      
(Income) loss from discontinued operations, net of taxes                 (38,749) (20,903) (80,898)
Depreciation and amortization                 0 0 0
Deferred and noncurrent income tax charges (credits)                 0 0 0
Accretion on discounted liabilities                 0 0 0
Pretax (gains) losses from sale of assets                 0 0 0
Net decrease (increase) in noncash operating working capital                 0 0 0
Equity in earnings                 61,479 0 0
Other operating activities - net                 0 0 0
Net cash provided by (used in) continuing operations                 0 0 0
Net cash provided by (used in) discontinued operations                 (17,887) 28,876 80,558
Net cash provided by operating activities                 (17,887) 28,876 80,558
Investing Activities                      
Property additions                 0 0 0
Proceeds from sale of assets                 0 0 0
Changes in restricted cash                 0    
Other investing activities - net                 0 0 0
Sales proceeds                 93,765 1,097 173,118
Other                 (7,443) (4,918) (3,088)
Net cash provided by (required by) investing activities                 86,322 (3,821) 170,030
Financing Activities                      
Purchase of treasury stock                 0 0 0
Repayments of long-term debt                 0 0 (1,170)
Additions to long-term debt                 0 0 0
Cash dividend to former parent                     0
Debt issuance costs                 0 0 0
Amounts related to share-based compensation                 0 0 0
Net distributions to former parent                 (69,377) (24,113) (249,418)
Net cash required by financing activities                 (69,377) (24,113) (250,588)
Net increase in cash and cash equivalents                 (942) 942 0
Cash and cash equivalents at January 1       $ 942       $ 0 942 0 0
Cash and cash equivalents at December 31 0       942       0 942 0
Less: Cash and cash equivalents held for sale 0       942       0 942 0
Cash and cash equivalents $ 0       $ 0       $ 0 $ 0 $ 0